1909] REIFF — FLACHERIE 101 
With this mixture the trunks of three trees (oak, birch and apple) were painted with a 
ring about ten cm. in width, placed right under the lowest larger branches. The 
caterpillars on these trees had just passed the third molt. At the end of three days 
the first dead specimens were found, after which the disease spread in the same 
manner as in the second experiment. At the time of pupation about sixty-three 
percent of this series of larvee had fallen a prey to the flacherie. 
As a fourth experiment, a mixture similar to the one just described was used and 
sprayed on the foliage of three more trees including oak, birch and apple, by means 
of a small “Spramotor” sprayer. ‘To make the spray adhere better to the leaves 
a small quantity of glue was added. In this case also the larvee had recently under- 
gone the third molt. At the end of two days the first dead specimens were observed 
and their number very rapidly increased from day to day, until at the time of pupa- 
tion about seventy percent had succumbed to the disease. 
In a fifth experiment twenty dead larvee were carefully dried, powdered in a 
mortar and then stirred into three liters of water. With this decoction three isolated 
trees were sprayed in the same manner as before, but this time the results were not 
very satisfactory, as before pupation only about forty percent of the larvee died. In 
this case the experiment also was begun after the caterpillars had already passed the 
third molt. It is possible that the lower percentage of deaths may have been due to 
the addition of too much water to the dried material. 
In all these experiments the still remaining pup were later looked for and it _ 
was found that an average of from ten to fifteen percent had died from flacherie. 
It must be expressly stated that the trees used in the experiment were regularly 
watered and their leaves sprinkled with ordinary tap water twice a week to counteract 
the effects of the unusually dry summer of 1909, and to keep them as nearly as possi- 
ble in anormal condition. It is also to be noted that the possibility of transfer of the 
flacherie from one tree to another through the agency of wind was well-nigh pre- 
cluded as only very slight winds occurred here, and besides, the trees treated were 
far removed from one another. Neither were any of the trees supplied with an 
unusually large number of larve in order that the possibility of contact between them 
might not be made abnormally probable. 
All caterpillars which were kept apart for control remained healthy. he control 
was managed in the following way. Ten caterpillars coming from each separate 
egg mass used in the experiments were separated after the second molt and each lot 
kept apart with great care. These were reared out of doors in special breeding cages 
which altered as little as possible the external conditions. They were fed on leaves 
from a small oak tree, especially selected for the purpose, which had been nearly free 
